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  <title>画一个椭圆</title>

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</div><hr /><div id="function.imageellipse" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">imageellipse</h1>
  <p class="verinfo">(PHP 4 &gt;= 4.0.6, PHP 5)</p><p class="refpurpose"><span class="refname">imageellipse</span> &mdash; <span class="dc-title">画一个椭圆</span></p>

 </div>
 <div class="refsect1 description" id="refsect1-function.imageellipse-description">
  <h3 class="title">说明</h3>
   <div class="methodsynopsis dc-description">
   <span class="type">bool</span> <span class="methodname"><strong>imageellipse</strong></span>
    ( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$image</code></span>
   , <span class="methodparam"><span class="type">int</span> <code class="parameter">$cx</code></span>
   , <span class="methodparam"><span class="type">int</span> <code class="parameter">$cy</code></span>
   , <span class="methodparam"><span class="type">int</span> <code class="parameter">$width</code></span>
   , <span class="methodparam"><span class="type">int</span> <code class="parameter">$height</code></span>
   , <span class="methodparam"><span class="type">int</span> <code class="parameter">$color</code></span>
   )</div>

  <p class="para rdfs-comment">
  在指定的坐标上画一个椭圆。
  </p>
 </div>

 <div class="refsect1 parameters" id="refsect1-function.imageellipse-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>

    <dt>
<em><code class="parameter">image</code></em></dt>

<dd>
<p class="para">由图象创建函数(例如<span class="function"><a href="function.imagecreatetruecolor.html" class="function">imagecreatetruecolor()</a></span>)返回的图象资源。</p></dd>

    
     <dt>
<em><code class="parameter">cx</code></em></dt>

     <dd>

      <p class="para">
       中间的 X 坐标。
      </p>
     </dd>

    
    
     <dt>
<em><code class="parameter">cy</code></em></dt>

     <dd>

      <p class="para">
       中间的 Y 坐标。
      </p>
     </dd>

    
    
     <dt>
<em><code class="parameter">width</code></em></dt>

     <dd>

      <p class="para">
       椭圆的宽度。
      </p>
     </dd>

    
    
     <dt>
<em><code class="parameter">height</code></em></dt>

     <dd>

      <p class="para">
       椭圆的高度。
      </p>
     </dd>

    
    
     <dt>
<em><code class="parameter">color</code></em></dt>

     <dd>

      <p class="para">
       椭圆的颜色。颜色标识符由
       <span class="function"><a href="function.imagecolorallocate.html" class="function">imagecolorallocate()</a></span> 创建。
      </p>
     </dd>

    
   </dl>

  </p>
 </div>

 <div class="refsect1 returnvalues" id="refsect1-function.imageellipse-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   成功时返回 <strong><code>TRUE</code></strong>， 或者在失败时返回 <strong><code>FALSE</code></strong>。
  </p>
 </div>

 <div class="refsect1 examples" id="refsect1-function.imageellipse-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-3150">
    <p><strong>Example #1 <span class="function"><strong>imageellipse()</strong></span> 例子</strong></p>
    <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br /><br /></span><span style="color: #FF8000">//&nbsp;新建一个空白图像<br /></span><span style="color: #0000BB">$image&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">imagecreatetruecolor</span><span style="color: #007700">(</span><span style="color: #0000BB">400</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">300</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">//&nbsp;填充背景色<br /></span><span style="color: #0000BB">$bg&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">imagecolorallocate</span><span style="color: #007700">(</span><span style="color: #0000BB">$image</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">0</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">0</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">0</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">//&nbsp;选择椭圆的颜色<br /></span><span style="color: #0000BB">$col_ellipse&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">imagecolorallocate</span><span style="color: #007700">(</span><span style="color: #0000BB">$image</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">255</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">255</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">255</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">//&nbsp;画一个椭圆<br /></span><span style="color: #0000BB">imageellipse</span><span style="color: #007700">(</span><span style="color: #0000BB">$image</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">200</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">150</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">300</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">200</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$col_ellipse</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">//&nbsp;输出图像<br /></span><span style="color: #0000BB">header</span><span style="color: #007700">(</span><span style="color: #DD0000">"Content-type:&nbsp;image/png"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">imagepng</span><span style="color: #007700">(</span><span style="color: #0000BB">$image</span><span style="color: #007700">);<br /><br /><br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
    </div>

    <div class="example-contents"><p>以上例程的输出类似于：</p></div>
    <div class="mediaobject">
     
     <div class="imageobject">
      <img src="images/21009b70229598c6a80eef8b45bf282b-imageellipse.png" alt="例子输出： imageellipse()" width="400" height="300" />
     </div>
    </div>
   </div>
  </p>
 </div>

 <div class="refsect1 notes" id="refsect1-function.imageellipse-notes">
  <h3 class="title">注释</h3>
  <blockquote class="note"><p><strong class="note">Note</strong>: 
   <p class="para">
    本函数需要 GD 2.0.2 或更高版本。
   </p>
  </p></blockquote>
 </div>

 <div class="refsect1 seealso" id="refsect1-function.imageellipse-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   <ul class="simplelist">
    <li class="member"><span class="function"><a href="function.imagefilledellipse.html" class="function" rel="rdfs-seeAlso">imagefilledellipse()</a> - 画一椭圆并填充</span></li>
    <li class="member"><span class="function"><a href="function.imagearc.html" class="function" rel="rdfs-seeAlso">imagearc()</a> - 画椭圆弧</span></li>
   </ul>
  </p>
 </div>

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